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Thuy, C.T.T.,Jung, J.H.,Thogiti, S.,Jung, W.S.,Ahn, K.S.,Kim, J.H. Pergamon Press 2016 ELECTROCHIMICA ACTA Vol.205 No.-
Polypyrrole (PPy) with graphene coated Al<SUB>2</SUB>O<SUB>3</SUB> (GCA) composite films with different levels of graphene were fabricated via a two-step process. GCA was first prepared. A dispersed solution of monomeric pyrrole and GCA was deposited on a fluorine doped tin oxide film by one-step electrodeposition and used as an electrocatalyst on the counter electrodes (CEs) for dye-sensitized solar cells (DSSCs). The DSSCs fabricated from these CEs were characterized by the current density-voltage, incident photon-to-current conversionss efficiency, cyclic voltammetry, electrochemical impedance spectroscopy, and Tafel measurements. The DSSCs containing the 3wt.% PPy/GCA (PPy/GCA) CE exhibited an efficiency of 7.33%, whereas the DSSCs with a CE having Pt as the catalytic material showed an efficiency of 7.57%. The results show that the PPy/GCA composite film is a potential catalyst for replacing the expensive, conventional Pt in DSSCs.
T. T. C. Thuy,N. N. Dinh,L. H. Chi 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.1
Thin nanostructured TiO$_2$ layers prepared by using a thermal treatment have been spin-coated and embedded in poly-[2-methoxy, 5-$(2^{'}$-ethyl-hexyloxy) phenylene vinylene] (MEH-PPV) films. Scaning electron microscopy (SEM) studies showed that a nc-TiO$_2$ layer grown at 700 $^\circ$C for 1.5 hour (PON2 sample) was very porous whereas nc-TiO$_2$ layers grown at the same temperature for, respectively, 1 hour and 2 hours (PON1 and PON3 samples) were quite dense. Study of the photoluminescence (PL) spectra of pure MEH-PPV and nanohybrid films has shown that excitation with a 325-nm-wavelength laser leads to the largest enhancement in photoluminescent intensity, as observed in the PON2 sample and that excitation with a 470-nm-wavelength laser leads to the strongest fluorescence quenching. Current-voltage (I-V) characteristics of laminar- layer devices with a structure of Ti/nc-TiO$_2$/MEH-PPV/Al-Ag in comparison with those of Ti/MEH-PPV/Al-Ag showed that the turn-on voltage of the first type of devices was as low as 4 V whereas for the second type, of the current going through the thin layer of MEH-PPV depended linearly on the voltage. Combining the I-V characteristics with the SEM and the PL results, the PON2 hybrid film is seen to be a good candidate for photovoltaic solar cell applications whereas the PON1 and PON3 are suitable for organic light-emitting diodes. Thin nanostructured TiO$_2$ layers prepared by using a thermal treatment have been spin-coated and embedded in poly-[2-methoxy, 5-$(2^{'}$-ethyl-hexyloxy) phenylene vinylene] (MEH-PPV) films. Scaning electron microscopy (SEM) studies showed that a nc-TiO$_2$ layer grown at 700 $^\circ$C for 1.5 hour (PON2 sample) was very porous whereas nc-TiO$_2$ layers grown at the same temperature for, respectively, 1 hour and 2 hours (PON1 and PON3 samples) were quite dense. Study of the photoluminescence (PL) spectra of pure MEH-PPV and nanohybrid films has shown that excitation with a 325-nm-wavelength laser leads to the largest enhancement in photoluminescent intensity, as observed in the PON2 sample and that excitation with a 470-nm-wavelength laser leads to the strongest fluorescence quenching. Current-voltage (I-V) characteristics of laminar- layer devices with a structure of Ti/nc-TiO$_2$/MEH-PPV/Al-Ag in comparison with those of Ti/MEH-PPV/Al-Ag showed that the turn-on voltage of the first type of devices was as low as 4 V whereas for the second type, of the current going through the thin layer of MEH-PPV depended linearly on the voltage. Combining the I-V characteristics with the SEM and the PL results, the PON2 hybrid film is seen to be a good candidate for photovoltaic solar cell applications whereas the PON1 and PON3 are suitable for organic light-emitting diodes.
T. Thuy Hoang,Minkyu Park,Do Duc Cuong,S. H. Rhim,S. C. Hong 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.2
Recently, a combined experimental and theoretical study has shown that anomalous Hall conductivity (AHC) can be tailored via tuning Berry curvature regardless of magnetization, which may pave a new way to achieve large AHC without net magnetic moment. For instance, non-negligible AHC of 330(133) Ω<SUP>-1</SUP>cm<SUP>-1</SUP> and 300 Ω<SUP>-1</SUP>cm<SUP>-1</SUP> were predicted in non-collinear antiferromagnetic and compensated ferrimagnetic Heusler compounds Mn₃Ge (Sn) and Ti₂MnAl. In this work, using the PAW and FLAPW methods implemented in VASP and Fleur codes, AHC of a ferrimagnet quaternary Heusler compounds TiZrMnAl (F43m) is studied. Among three possible structural phases (Fig. 1), α-phase is energetically most stable, by energy differences of 0.34 eV/fu and 0.03 eV/fu compared to β- and γ-phase. The local magnetic moment of Mn is antialigned with those of Ti and Zr. As a result, total magnetic moment is fully compensated (mt = 0.0 μB) in α- and β-phase, and nearly compensated (mt = 0.1 μB) in γ-phase. Interestingly, α-phase possesses a large AHC of 1470 Ω<SUP>-1</SUP>cm<SUP>-1</SUP>, while β- and γ-phase show moderate AHC of 200 and 100 Ω<SUP>-1</SUP>cm<SUP>-1</SUP>, consistently in both the PAW and FLAPW methods. The large AHC in α-phase stems from the direct gapless band along the symmetry line LM, which shows a gigantic Berry curvature and nontrivial topology with non-zero Chern number x = ±1. 〈그림 본문참조〉
A First-principles Study on Half-metallicity of LiCrSb/InSb Hybrid System
T. Thuy Hoang,S. H. Rhim,S. C. Hong 한국자기학회 2022 Journal of Magnetics Vol.27 No.3
It was recently predicted that alkali-metal-based half-Heusler compounds have robust half-metallicity with wide band gaps (1.60-2.38 eV), and the half-metallicity is retained at surface and under severe strain. In this study, we investigate the half-metallicity and electronic structure of the LiCrSb/InSb hybrid system to reveal real applicability of an alkali-metal-based half-Heusler compound to spintronics using first-principles calculations. Half-metallicity at the interface is well retained, and a proximate effect opens a gap in the minority spin band of the InSb layer with band gaps of 0.55-0.65 eV. The whole LiCrSb/InSb hybrid system prefers magnetization parallel to the plane.